Add plugin to delete data-test attributes from production build

[paleika]

There is a plugin for that:
"babel-plugin-react-remove-properties": "^0.3.0",

babelrc should contain it's settings:

  "plugins": [
    <...>,
    [
      "react-remove-properties",
      {"properties": ["data-test"]}
    ]
  ]

babelrc should have different configs for different environments:

{
  "env": {
    "dev": {
      "presets": [],
      "plugins": []
    },
    "test": {
      "presets": [],
      "plugins": []
    }
  }
}

and the env is set in webpack.js

{
  "loader": "babel-loader",
  "options": {
    "envName": 'yourEnvironmentName'
  }
}